Brake mechanism



Jan. 22, 1929. 1,699,896

F. W, LANCHESTER BRAKE MECHANISM Filed July 1e, 1924 2 sheets-:sheet 2 Patented Jaim 22, lQR

N1,699,896 earlier orrylce@ FREDERICK W'ILLIAM LANCHESTER, 0F LONDON', EIil'GiIiANII),` ASIGNOR TO LANCI'IES- TERS LABORATORIES LIMTED, 0F COVENTRY, ENGLAND.

BRAKE MEGHANISM.

Application le July 16, 1924i-, Serial No. 726,392, and in Great Britain July 19, 1923.

Vmechanism of this type.

The invention is particularly applicable to the front or steering wheels oi a Vehicle Abut it may be applied also 'to the rear or driving wheels. Referring to the accompanying drawingsz- Figure l shows in vertical section, and

Figure 2 in elevation part section a convenient construction oi' front brake inechanism in accordance with the present inven tion.

Figure 2 represents a part plan view of a detail; and

Figure 3 is a similar view to Figures land 2 in respect of a rear brake mechamsm.

@ne mode of carrying the present invention into effect as applied to a liront wheel brake is illustrated in Figures l and 2. A bracket a formingpart et a brake cover plate b is secured to the stock ot the stub axle c and is mounted in a suitable position above the pivot pin d. A spherical socket is provided in this bracket whose centre is approximately in line with the axis of the pivot pin Z and .in this socket is housed the ball end e ot a shaft f carrying` an external lever f/ adapted to be moved through a suitable angle by actuating mechanism (not shown). The ball end or the shaft f is recessed to provide a seat or abutment ttor a spherical-headed link` or cam 7L el dumbbell torni, the said seat or abutment being),-

eccentric to the ball end c. rl`he opposite end 7u ot the dumb-bell link 7i. is also spherical and arts between the fhorns oi' the brake member which are shod with hardened steel pallets, m, m, having inclined plane tacos to engage with the sphericalfended link. lVlien the Vactuating,1 shaft is rotated the dumb-bell head 73 is forced like a wedge between the horn pallets fm., my, oit' the brake member jj expanding same and bringing the first brake member y' floating through a sut`iicient angle to take up the clearance of the second brake member g and any wear on same that may develop.

The spherical end e of the actuating shaft 7 permits of the steering movement of the road wheel through the angle of turn `re-` quired With perfect freedom and the spherical ends of the knuckle link 7L also allows of a certain degree ot.lateral movement in addition to the Heating movement aforementioned.`

ln operation, when the operating arm g is actuated the spherical end e of the rod f is rocked in its seating andthe dumb-bell L is moved upwards. l

The head 7c thus spreads the horn pallets m, m, and causes the friction surface oit the ring j to'engage the brake drum n. The

ringsr is thereby carried round somewhat until the projection p thereon in bearing upon one end ot the ring q causes the other end of this ring to abut the xed abutment r as will be clear by reference to Figure 2u. rlhe ring` Q is therefore expanded also as the wheel rotates so as to cause its friction surface to engage the brake drum.

The braking action is independent oi the direction of rotation ot' the wheel.

It will be understood that the brake cle ments have a certain amount of inward clasticity and when the `bra-ke is not be'np; applied they centre themselves on a drum or spider forming part of the brake cover plate.

According;` to the modilication illustrated diagrannnatically in Figure 3, the operation of moving the dumb-bell 7L is somewhat dit ferent. In this example a thrust bar u is adapted to bear within a socket formed in one end v oit' the dumb-bell fr, by means ot thrust applied by a quick pitch threaded member 'w actuated by the arm w.

Having now described my invention, what be actuated by an operating lever and a" oatinff Wedge member formed as n dumbbell with the spherical ends interposed between said sloping ebutments und said cup, said member possessing freedom of motion in planes containingr its exis.

2. Internal expanding brake mechanism of the type described including u pair of slopingr abutments at the ends of one band element, a spherical cup socket formed in the spherical head of an operating spindle and a. floating Wedge member formed as a dumb-bell with spherical ends interposed bet-Ween said sloping abutments and said socket.

3. Internal expanding brake mechanism of the type described includingr e pair oi sloping abutments at the endsof one band element, e spherical cup attached to be actuated by nnoperating lever :1nd n floating Wedge member interposed between said sloping abutment and said cup, seid member posssesing freedom of motion in plaines containing its axis and possessing rotational freedom about its axis.

In testimony whereof I have signed my naine to this specification.

FREDERICK WILLIAM LANCHESTER. 

